Use default execution options for GetVariables

Author: andyleejordan

src/PowerShellEditorServices/Services/DebugAdapter/DebugService.cs

@@ -261,7 +261,7 @@ public async Task<VariableDetailsBase[]> GetVariables(int variableReferenceId, C
                     // We execute this on the pipeline thread so the expansion of child variables works.
                     childVariables = await _executionService.ExecuteDelegateAsync(
                         $"Getting children of variable ${parentVariable.Name}",
-                        new ExecutionOptions { Priority = ExecutionPriority.Next },
+                        executionOptions: null,
                         (_, _) => parentVariable.GetChildren(_logger), cancellationToken).ConfigureAwait(false);
 
                     foreach (VariableDetailsBase child in childVariables)